Greencastle, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Greencastle, a borough in Franklin County, Pennsylvania.
This Afternoon
82°F
Partly Sunny
Partly sunny, with a high near 82. North wind around 8 mph.
7-day forecast for Greencastle
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 82°F | Partly Sunny | 8 mph N | 6% |
| Tonight | 55°F | Partly Cloudy | 7 mph N | 0% |
| Saturday | 77°F | Mostly Sunny | 3 to 7 mph E | 3% |
| Saturday Night | 65°F | Chance Rain Showers | 5 to 10 mph SE | 33% |
| Sunday | 80°F | Showers And Thunderstorms | 6 to 10 mph S | 85% |
| Sunday Night | 61°F | Showers And Thunderstorms | 3 to 10 mph W | 85% |
| Monday | 71°F | Chance Rain Showers | 10 mph NE | 39% |
| Monday Night | 57°F | Rain Showers Likely | 7 to 10 mph NE | 63% |
| Tuesday | 63°F | Rain Showers Likely | 10 mph NE | 74% |
| Tuesday Night | 52°F | Rain Showers Likely | 10 mph NE | 74% |
| Wednesday | 60°F | Rain Showers Likely | 10 mph NE | 58% |
| Wednesday Night | 52°F | Showers And Thunderstorms Likely | 7 to 10 mph NE | 55% |
| Thursday | 63°F | Chance Showers And Thunderstorms | 10 mph NE | 51% |
| Thursday Night | 52°F | Chance Rain Showers | 3 to 7 mph N | 36% |
Forecast source: National Weather Service (api.weather.gov) for Greencastle (39.791, -77.727). Updated through the day.
Growing snapshot for Greencastle
Last spring frost
Apr 7
First fall frost
Nov 4
Growing season
209 days
Hardiness zone
7a
More local growing data for Greencastle: nearby ZIP 17225 weather · frost dates · planting calendar · Pennsylvania frost dates
Nearby towns & communities
Blue Ridge Summit
Chambersburg
Fayetteville
Fort Loudon
Guilford
Marion
Mercersburg
Mont Alto
Orrstown
Pen Mar
Rouzerville
Scotland
State Line
Wayne Heights
Waynesboro
Climate data from the nearest NOAA station, Hagerstown Washington Co Ap, Md (5.5 mi from Greencastle). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.